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Composite material for displaying latent fingerprint and preparation method thereof

A composite material and uniform mixing technology, applied in the directions of luminescent materials, chemical instruments and methods, applications, etc., can solve the problem of no gold nanoclusters and montmorillonite composite composite materials, toxic organisms and ecological environment hazards, unfavorable fingerprint substances, etc. problems, to achieve the effect of reducing costs, simple and easy operation, safe and environmentally friendly preparation process

Inactive Publication Date: 2018-05-22
喻彦林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, gold nanoclusters are mostly visualized by soaking and spraying liquid reagents. For example, the patent application with publication number CN101485572A discloses a method for one-step visualization of latent fingerprints using glucose or sucrose-modified gold nanoparticles, but the method shows latent fingerprints. , it will bring a certain degree of contamination to the fingerprint carrier, which is not conducive to further analysis of the fingerprint material and limits its application in criminal scenes
[0005] Montmorillonite is also used to prepare latent fingerprints to display fluorescent powder. For example, the patent application with publication number CN101735817A discloses a method of embedding II-VI semiconductor quantum dots CdTe with high fluorescence characteristics between montmorillonite matrix layers by nanotechnology. The method of preparing imprints to extract nano-fluorescent powder, but due to the toxicity of quantum dots itself, it will cause potential harm to humans, other organisms and the ecological environment. At the same time, CdTe will inhibit cell proliferation, cause cell apoptosis, and inhibit cell mitosis ("three different Cytotoxicity Comparison of Structural Quantum Dots (CdTe, CdTe / CdS, CdTe / CdS / ZnS), Ke Li, Master's Thesis of Central South University, 2013, Abstract)
[0006] Currently, there is no composite material combining gold nanoclusters and montmorillonite for latent fingerprint visualization in the literature and on the market

Method used

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  • Composite material for displaying latent fingerprint and preparation method thereof
  • Composite material for displaying latent fingerprint and preparation method thereof
  • Composite material for displaying latent fingerprint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A gold nanocluster-montmorillonite nanocomposite material for latent fingerprint display, the specific steps of its preparation method are as follows:

[0053] A. Dry the montmorillonite in an oven at 30°C for 2 hours, take 0.1000 g of the dried montmorillonite, and add 1.0 mL of bovine serum albumin solution with a concentration of 10 mg / ml to it, mix well and use a mixer (70 rpm ) for 30 minutes, then centrifuged at 6000 rpm for 10 minutes, and removed the supernatant;

[0054] B. Add 1ml of chloroauric acid solution with a concentration of 10mmol / L to the precipitate obtained by centrifugation, stir magnetically for 30min, then centrifuge at 6000rpm for 10min, remove the supernatant, and add 1.1ml with a concentration of 0.5mol / L to the precipitate obtained by centrifugation NaOH solution, after mixing evenly, heat it in a microwave oven under high fire (600W) for 10s;

[0055] C. The product obtained in step B was washed with water and then centrifuged, and the obt...

Embodiment 2

[0057] A gold nanocluster-montmorillonite nanocomposite material for latent fingerprint display, the specific steps of its preparation method are as follows:

[0058] A. Dry the montmorillonite in an oven at 80°C for 2.5h, take 0.1000g of the dried montmorillonite, and add 1.0mL of bovine serum albumin solution with a concentration of 200mg / ml to it, mix well and use a mixer ( 70rpm) for 30min, then centrifuged at 6000rpm for 10min, and removed the supernatant;

[0059] B. Add 1ml concentration of chloroauric acid solution of 100mmol / L to the precipitate obtained by centrifugation, stir magnetically for 30min, then centrifuge at 6000rpm for 10min, remove the supernatant, and add 0.8ml concentration of 5mol / L to the precipitate obtained by centrifugation NaOH solution, after mixing evenly, heat it in a microwave oven under high fire (1000W) for 3s;

[0060] C. The product obtained in step B was washed with water and then centrifuged, and the obtained precipitate was dried in v...

Embodiment 3

[0062] A gold nanocluster-montmorillonite nanocomposite material for latent fingerprint display, the specific steps of its preparation method are as follows:

[0063] A. Dry the montmorillonite in an oven at 60°C for 2 hours, take 0.1000 g of the dried montmorillonite, and add 1.0 mL of bovine serum albumin solution with a concentration of 100 mg / ml to it, mix well and use a mixer (70 rpm ) for 30 minutes, then centrifuged at 6000 rpm for 10 minutes, and removed the supernatant;

[0064] B. Add 1ml concentration of chloroauric acid solution of 25mmol / L to the precipitate obtained by centrifugation, stir magnetically for 30min, then centrifuge at 6000rpm for 10min, remove the supernatant, and add 1ml concentration of 2.5mol / L to the precipitate obtained by centrifugation NaOH solution, after mixing evenly, heat it in a microwave oven under high fire (800W) for 8s;

[0065] C. The product obtained in step B was washed with water and then centrifuged, and the obtained precipitat...

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Abstract

The invention belongs to the technical field of light-emitting materials which contain beryllium, magnesium, an alkali metal or an alkaline-earth metal, and particularly relates to a composite material for displaying a latent fingerprint. The composite material for displaying the latent fingerprint is formed by compounding a gold nano-cluster and bovine serum albumin-supported montmorillonoid. Thecomposite material provided by the invention is safe and non-toxic, has high biocompatibility, and does not pollute a fingerprint carrier and a fingerprint residue when the latent fingerprint is displayed; the composite material can be excited by using ultraviolet light and visible light, and can also be excited by infrared light; the composite material effectively avoids background fluorescent interference, is beneficial to improvement of the quality of a fingerprint image, and avoids the damage of ultraviolet irradiation to the fingerprint carrier, a fingerprint substance and an operator; astreakline type (a first-grade characteristic) of a fingerprint and a general detail characteristic (a second-grade characteristic) of the fingerprint can be displayed, and a third-grade characteristic of the fingerprint, such as, sweat pores, can be displayed clearly; moreover, the stability is high.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials containing beryllium, magnesium, alkali metals or alkaline earth metals, and in particular relates to a composite material for displaying latent fingerprints and a preparation method thereof. Background technique [0002] Fingerprints are the skin patterns on the first knuckles, which are unique to each person and leave traces on objects. They are one of the most reliable and convenient methods of personal identification and one of the most important criminal evidence. Compared with other biometric identification methods such as face recognition and iris recognition, fingerprint recognition has the advantages of uniqueness, relative stability and relatively easy acquisition (“Fingerprint Recognition Technology and Its Application”, Mei Zhongling, People’s Public Security University of China Journal (Natural Science Edition), No. 2, 2008, first paragraph of the left column on page 81)...

Claims

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Application Information

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IPC IPC(8): C09K11/58C09K11/02A61B5/1172
CPCA61B5/1172C09K11/025C09K11/582
Inventor 喻彦林颜磊
Owner 喻彦林
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